Microchip Technology MIC5528-3.0YMX-TR

Overview

MIC5528-3.0YMX-TR from Microchip Technology is a 3.0 V fixed-output, 500 mA low-dropout linear regulator in a 1.2 mm × 1.2 mm × 0.4 mm extra thin DFN package. It delivers ±2% output voltage accuracy at room temperature, 260 mV dropout at 500 mA load, and draws only 38 µA quiescent current. Designed for space-constrained battery-powered systems, it supports stable operation with 2.2 µF ceramic output capacitors and includes auto-discharge and internal enable pull-down.

For engineers reviewing the MIC5528-3.0YMX-TR datasheet, MIC5528-3.0YMX-TR pinout, MIC5528-3.0YMX-TR application, or MIC5528-3.0YMX-TR equivalent, key selection criteria include its ultra-small footprint, guaranteed 500 mA output under 2.5–5.5 V input, thermal shutdown protection, and TTL-compatible active-high enable functionality with zero-off-mode current.

Technical Context

The MIC5528-3.0YMX-TR implements a µCap architecture optimized for minimal external capacitance-requiring only 2.2 µF ceramic output capacitance for stability across –40°C to +125°C junction temperature. Its internal circuitry integrates an active-high enable input with 4 MΩ internal pull-down, auto-discharge NFET (25 Ω), and linear current-limit protection (525–800 mA).

It operates as a high-bandwidth LDO with 70 dB PSRR at 100 Hz and 60 dB at 1 kHz, while maintaining no-load regulation-a critical feature for CMOS RAM keep-alive circuits. Dropout voltage is specified at 80 mV typical (150 mA) and 260 mV typical (500 mA), with ground current rising only from 38 µA (no load) to 65 µA (500 mA).

Key Specifications

Pinout & Package

Package: 6-pin 1.2 mm × 1.2 mm × 0.4 mm extra thin DFN (XTDFN, MX suffix), ePad exposed thermal pad (to be connected to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700-3002E/TO and XC6206P302MR-G, the MIC5528-3.0YMX-TR uniquely combines 500 mA output, auto-discharge, and 1.2 mm × 1.2 mm footprint-making it optimal for space-constrained, medium-current portable systems requiring fast turn-off and robust thermal behavior.

Availability

MIC5528-3.0YMX-TR is available at Aetrix Electronics and suitable for portable medical devices, GPS modules, digital still cameras, and personal media players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC5528-3.0YMX-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global provider of microcontrollers, analog, FPGA, and power management semiconductors, with design centers and manufacturing facilities across the Americas, Asia, and Europe.

The MIC5528 product line delivers high-performance, ultra-compact LDO regulators targeting battery-powered portable electronics where board space, thermal efficiency, and fast transient response are critical.

FAQ

What is the maximum input voltage rating for the MIC5528-3.0YMX-TR?

The MIC5528-3.0YMX-TR has an absolute maximum input voltage rating of +6 V, but its operational input range is strictly +2.5 V to +5.5 V. Exceeding 5.5 V may cause permanent damage or unpredictable behavior. The device is designed for single-cell Li-ion (up to 4.2 V), Li-poly, or regulated 3.3 V/5 V system rails - and the MIC5528-3.0YMX-TR must never be operated outside its specified operating range.

Does the MIC5528-3.0YMX-TR require an input capacitor, and what type is recommended?

Yes, the MIC5528-3.0YMX-TR requires a 2.2 µF ceramic input capacitor from VIN to GND for stability and high-frequency noise filtering. X5R or X7R dielectric types are recommended due to their stable capacitance over temperature and voltage. Y5V or Z5U dielectrics are not recommended because they lose >50% capacitance over temperature - risking instability. The MIC5528-3.0YMX-TR's high bandwidth makes proper input decoupling essential.

How does the auto-discharge feature work on the MIC5528-3.0YMX-TR?

When the EN pin is driven low, the MIC5528-3.0YMX-TR activates an internal 25 Ω NFET between VOUT and GND, discharging external output capacitors rapidly. This prevents residual voltage from powering downstream circuitry unintentionally after shutdown. The feature is automatic and requires no external components - and the MIC5528-3.0YMX-TR implements it regardless of load condition or output capacitor value.

Can the MIC5528-3.0YMX-TR operate with no load, and is it stable under that condition?

Yes, the MIC5528-3.0YMX-TR remains fully stable and in regulation with zero load - a key differentiator from many competing LDOs. This is essential for applications like CMOS RAM keep-alive circuits or always-on sensor bias rails. Stability is maintained across the full –40°C to +125°C junction temperature range using only the specified 2.2 µF ceramic output capacitor - and the MIC5528-3.0YMX-TR does not require minimum load resistors.

What is the thermal resistance (θJA) of the MIC5528-3.0YMX-TR, and how does it affect maximum ambient temperature?

The MIC5528-3.0YMX-TR in its 6-pin extra thin DFN (MX) package has a junction-to-ambient thermal resistance (θJA) of 173°C/W under standard PCB conditions (1-layer 1 oz Cu, 1 cm² GND pad). At 500 mA load with 3.6 V input and 3.0 V output, power dissipation is ~300 mW - limiting maximum ambient temperature to ~99°C before thermal shutdown triggers. Proper ePad grounding is required to achieve this θJA - and the MIC5528-3.0YMX-TR's 0.4 mm height enables use in ultra-thin assemblies.